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Note 18 - Quarterly Financial Information (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014
Charges to Estimated Revenues	$ 9.5	$ 4.5

X

- Definition

Represents charges to estimated revenues.

+ References

No definition available.

+ Details

Name:	strl_ChargesToEstimatedRevenues
Namespace Prefix:	strl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration